TCountdownEvent (C++)

Description

The following example is a console application that illustrates the use of the TCountdownEvent class.

Code

#include <vcl.h>
#pragma hdrstop

#include <tchar.h>
#include <Classes.hpp>
#include <iostream.h>
using namespace std;
// ---------------------------------------------------------------------------

#pragma argsused

static TCountdownEvent *runwayFlag;

class TThreadIgnite : public TThread {
private:
	void __fastcall Execute() {
		runwayFlag->WaitFor();
		// Next statements are executed only
		//  after runwayFlag->CurrentCount becomes 0
		cout << runwayFlag->CurrentCount << " -> Ignited" << endl;
	}

public:
	TThreadIgnite(bool createSuspended) : TThread(createSuspended) {
	}
};

int _tmain(int argc, _TCHAR* argv[]) {
	runwayFlag = new TCountdownEvent(200);
	runwayFlag->Reset();

	TThread *thread = new TThreadIgnite(true);
	thread->Start();

	while (runwayFlag->IsSet == false) {
		cout << runwayFlag->CurrentCount << endl;
		runwayFlag->Signal();
	}

	Sleep(10); // Let the thread print the message "0 -> Ignited"

	return 0; // Put breakpoint here to see the console output.
}

Uses

• System.SyncObjs.TCountdownEvent ( fr | de | ja )
• System.SyncObjs.TCountdownEvent.Signal ( fr | de | ja )
• System.SyncObjs.TCountdownEvent.WaitFor ( fr | de | ja )